I like the size of this bag, it is ginormous. Here are a few pictures to show the size, one with a ruler and my hand, and another of the bag draped over Betty:
I gave the bag heft with a layer of quilt batting, and the lining bottom is interfaced with Peltex, and the outer fabric bottom is interlined with more batting. Here’s a view of the inside:
You can see how I made rows of stitching around the oval bottom piece on the lining, and I also stitched the outer fabric bottom. I used the strap pattern piece unchanged as to length, and I think it is a very good length and fits well over the shoulder, which is how my daughter likes to carry her bags. This pattern is a good one, and seems to be well drafted. You can always tell that when you try to inset a piece like the bottom oval into the constructed bag -will it fit, or will it be a colossal hassle to sew? In this pattern it fit very well and was relatively easy to sew.